True, we are currently eliminating a lot of UB from the future C standard to avoid compilers breaking more code.
Still, while I acknowledge that this is a real issue, in practice I find my C code from 30 years ago still working.
It is also a bit the fault of users. Why favor so many user the most aggressive optimizing compilers? Every user filing bugs or complaining about aggressive optimizing breaking code in the bug tracker, very user asking for better warnings, would help us a lot pushing back on this. But if users prefer compiler A over compiler B when you a 1% improvement in some irrelevant benchmark, it is difficult to argue that this is not exactly what they want.
Still, while I acknowledge that this is a real issue, in practice I find my C code from 30 years ago still working.
It is also a bit the fault of users. Why favor so many user the most aggressive optimizing compilers? Every user filing bugs or complaining about aggressive optimizing breaking code in the bug tracker, very user asking for better warnings, would help us a lot pushing back on this. But if users prefer compiler A over compiler B when you a 1% improvement in some irrelevant benchmark, it is difficult to argue that this is not exactly what they want.